EP3827993B1 - Puce de tête, tête à jet liquide et dispositif d'impression à jet liquide - Google Patents

Puce de tête, tête à jet liquide et dispositif d'impression à jet liquide Download PDF

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Publication number
EP3827993B1
EP3827993B1 EP20210390.9A EP20210390A EP3827993B1 EP 3827993 B1 EP3827993 B1 EP 3827993B1 EP 20210390 A EP20210390 A EP 20210390A EP 3827993 B1 EP3827993 B1 EP 3827993B1
Authority
EP
European Patent Office
Prior art keywords
flow channel
ejection
along
axis direction
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20210390.9A
Other languages
German (de)
English (en)
Other versions
EP3827993A1 (fr
Inventor
Masakazu Hirata
Kenji Suzuki
Masanori Tamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SII Printek Inc
Original Assignee
SII Printek Inc
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Filing date
Publication date
Application filed by SII Printek Inc filed Critical SII Printek Inc
Publication of EP3827993A1 publication Critical patent/EP3827993A1/fr
Application granted granted Critical
Publication of EP3827993B1 publication Critical patent/EP3827993B1/fr
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/1433—Structure of nozzle plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14411—Groove in the nozzle plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14467—Multiple feed channels per ink chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14491—Electrical connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head

Definitions

  • the present disclosure relates to a head chip, a liquid jet head and a liquid jet recording device.
  • Liquid jet recording devices equipped with liquid jet heads are used in a variety of fields, and a variety of types of liquid jet heads have been developed (see, e.g., JP-A-2015-178209 , EP 2 363 291 A1 ).
  • Such a liquid jet head is provided with a head chip for jetting ink (liquid).
  • a head chip or the like in general, it is required to suppress the manufacturing cost and to improve print image quality. It is desirable to provide a head chip, a liquid jet head, and a liquid jet recording device capable of improving the print image quality while suppressing the manufacturing cost.
  • the head chip according to an embodiment of the present disclosure is defined according to claim 1.
  • the liquid jet head according to an embodiment of the present disclosure includes the head chip according to the embodiment of the present disclosure.
  • the liquid jet recording device includes the liquid jet head according to the embodiment of the present disclosure.
  • the head chip, the liquid jet head, and the liquid jet recording device according to an embodiment of the present disclosure, it becomes possible to improve the print image quality while suppressing the manufacturing cost.
  • FIG. 1 is a perspective view schematically showing a schematic configuration example of a printer 1 as a liquid jet recording device according to an embodiment of the present disclosure.
  • the printer 1 is an inkjet printer for performing recording (printing) of images, characters, and the like on recording paper P as a recording target medium using ink 9 described later.
  • the recording target medium is not limited to paper, but includes a material on which recording can be performed such as ceramic or glass.
  • the printer 1 is provided with a pair of carrying mechanisms 2a, 2b, ink tanks 3, inkjet heads 4, circulation channels 50, and a scanning mechanism 6. These members are housed in a chassis 10 having a predetermined shape. It should be noted that the scale size of each of the members is accordingly altered so that the member is shown large enough to recognize in the drawings used in the description of the specification.
  • the printer 1 corresponds to a specific example of the "liquid jet recording device” in the present disclosure
  • the inkjet heads 4 each correspond to a specific example of a “liquid jet head” in the present disclosure
  • the ink 9 corresponds to a specific example of the "liquid” in the present disclosure.
  • the carrying mechanisms 2a, 2b are each a mechanism for carrying the recording paper P along a carrying direction d (an X-axis direction) as shown in FIG. 1 .
  • These carrying mechanisms 2a, 2b each have a grit roller 21, a pinch roller 22, and a drive mechanism (not shown).
  • This drive mechanism is a mechanism for rotating (rotating in a Z-X plane) the grit roller 21 around an axis, and is constituted by, for example, a motor.
  • the ink tanks 3 are each a tank for containing the ink 9 inside.
  • the ink tanks 3 there are provided four types of tanks for individually containing four colors of ink 9, namely yellow (Y), magenta (M), cyan (C), and black (K), in this example as shown in FIG. 1 .
  • Y yellow
  • M magenta
  • C cyan
  • K black
  • the ink tank 3Y for containing the ink 9 having a yellow color
  • the ink tank 3M for containing the ink 9 having a magenta color
  • the ink tank 3C for containing the ink 9 having a cyan color
  • the ink tank 3K for containing the ink 9 having a black color.
  • These ink tanks 3Y, 3M, 3C, and 3K are arranged side by side along the X-axis direction inside the chassis 10.
  • ink tanks 3Y, 3M, 3C, and 3K have the same configuration except the color of the ink 9 contained, and are therefore collectively referred to as ink tanks 3 in the following description.
  • the inkjet heads 4 are each a head for jetting (ejecting) the ink 9 having a droplet shape from a plurality of nozzles (nozzle holes H1, H2) described later to the recording paper P to thereby perform recording (printing) of images, characters, and so on.
  • the inkjet heads 4 there are also disposed four types of heads for individually jetting the four colors of ink 9 respectively contained in the ink tanks 3Y, 3M, 3C, and 3K described above in this example as shown in FIG. 1 .
  • the inkjet head 4Y for jetting the ink 9 having a yellow color
  • the inkjet head 4M for jetting the ink 9 having a magenta color
  • the inkjet head 4C for jetting the ink 9 having a cyan color
  • the inkjet head 4K for jetting the ink 9 having a black color.
  • These inkjet heads 4Y, 4M, 4C and 4K are arranged side by side along the Y-axis direction inside the chassis 10.
  • inkjet heads 4Y, 4M, 4C and 4K have the same configuration except the color of the ink 9 used therein, and are therefore collectively referred to as inkjet heads 4 in the following description. Further, the detailed configuration example of the inkjet heads 4 will be described later ( FIG. 2 through FIG. 6 ).
  • the circulation channels 50 each have flow channels 50a, 50b.
  • the flow channel 50a is a flow channel of a part extending from the ink tank 3 to the inkjet head 4 via a liquid feeding pump (not shown).
  • the flow channel 50b is a flow channel of a part extending from the inkjet head 4 to the ink tank 3 via the liquid feeding pump (not shown).
  • the flow channel 50a is a flow channel through which the ink 9 flows from the ink tank 3 toward the inkjet head 4.
  • the flow channel 50b is a flow channel through which the ink 9 flows from the inkjet head 4 toward the ink tank 3.
  • the ink 9 is circulated between the inside of the ink tank 3 and the inside of the inkjet head 4.
  • these flow channels 50a, 50b supply tubes of the ink 9) are each formed of, for example, a flexible hose having flexibility.
  • the scanning mechanism 6 is a mechanism for making the inkjet heads 4 perform a scanning operation along the width direction (the Y-axis direction) of the recording paper P.
  • the scanning mechanism 6 has a pair of guide rails 61a, 61b disposed so as to extend along the Y-axis direction, a carriage 62 movably supported by these guide rails 61a, 61b, and a drive mechanism 63 for moving the carriage 62 along the Y-axis direction.
  • the drive mechanism 63 has a pair of pulleys 631a, 631b disposed between the guide rails 61a, 61b, an endless belt 632 wound between these pulleys 631a, 631b, and a drive motor 633 for rotationally driving the pulley 631a. Further, on the carriage 62, there are arranged the four types of inkjet heads 4Y, 4M, 4C and 4K described above side by side along the Y-axis direction.
  • such a scanning mechanism 6 and the carrying mechanisms 2a, 2b described above constitute a moving mechanism for moving the inkjet heads 4 and the recording paper P relatively to each other.
  • the moving mechanism of such a method is not a limitation, and it is also possible to adopt, for example, a method (a so-called “single-pass method") of moving only the recording target medium (the recording paper P) while fixing the inkjet heads 4 to thereby move the inkjet heads 4 and the recording target medium relatively to each other.
  • FIG. 2 is a diagram schematically showing a bottom view (an X-Y bottom view) of a configuration example of the inkjet head 4 in the state in which a nozzle plate 411 and alignment plate 415(described later) are detached.
  • FIG. 3 is a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of the inkjet head 4 along the line III-III shown in FIG. 2 .
  • FIG. 4 is a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of the inkjet head 4 along the line IV-IV shown in FIG. 2 .
  • FIG. 3 is a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of the inkjet head 4 along the line III-III shown in FIG. 2 .
  • FIG. 4 is a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of the
  • FIG. 5 is a diagram schematically showing a planar configuration example (an X-Y planar configuration example) of the inkjet head 4 on the upper surface side of a cover plate 413 (described later) shown in FIG. 3 and FIG. 4 .
  • FIG. 6 is a diagram schematically showing another cross-sectional configuration example (a Z-X cross-sectional configuration example) in the head chip 41 shown in FIG. 3 and FIG. 4 .
  • the ejection channel C1e and the nozzle hole H1 disposed so as to correspond to a nozzle array An1 described later are illustrated as a representative for the sake of convenience.
  • the ejection channel C2e and the nozzle hole H2 disposed so as to correspond to a nozzle array An2 described later are provided with substantially the same configurations, and are therefore omitted from the illustration.
  • the inkjet heads 4 are each an inkjet head of a so-called side-shoot type for ejecting the ink 9 from a central part in an extending direction (the Y-axis direction) of a plurality of channels (a plurality of channels C1 and a plurality of channels C2) in a head chip 41 described later. Further, the inkjet heads 4 are each an inkjet head of a circulation type which uses the circulation channel 50 described above to thereby use the ink 9 while circulating the ink 9 between the inkjet head 4 and the ink tank 3.
  • the inkjet heads 4 are each provided with the head chip 41. Further, the inkjet heads 4 are each provided with a circuit board and flexible printed circuit board (FPC) as a control mechanism (a mechanism for controlling the operation of the head chip 41) not shown.
  • FPC flexible printed circuit board
  • the circuit board is a board for mounting a drive circuit (an electric circuit) for driving the head chip 41.
  • the flexible printed circuit board is a board for electrically connecting the drive circuit on the circuit board and drive electrodes Ed described later in the head chip 41 to each other. It should be noted that it is arranged that such flexible printed circuit board is provided with a plurality of extraction electrodes as printed wiring.
  • the head chip 41 is a member for jetting the ink 9 along the Z-axis direction, and is configured using a variety of types of plates. Specifically, as shown in FIG. 3 , FIG. 4 , and FIG. 6 , the head chip 41 is mainly provided with the nozzle plate (a jet hole plate) 411, the actuator plate 412, the cover plate 413, and an alignment plate 415.
  • the nozzle plate 411, the alignment plate 415, the actuator plate 412, and the cover plate 413 are bonded to each other using, for example, an adhesive, and are stacked on one another in this order along the Z-axis direction. It should be noted that the description will hereinafter be presented with the cover plate 413 side along the Z-axis direction referred to as an upper side, and the nozzle plate 411 side referred to as a lower side.
  • the nozzle plate 411 is formed of a film member made of polyimide or the like having a thickness of, for example, about 50 ⁇ m, and is bonded (via the alignment plate 415) to a lower surface of the actuator plate 412 as shown in FIG. 3 , FIG. 4 , and FIG. 6 .
  • the constituent material of the nozzle plate 411 is not limited to the resin material such as polyimide, but can also be, for example, a metal material.
  • the nozzle plate 411 is provided with two nozzle arrays (the nozzle arrays An1, An2) each extending along the X-axis direction. These nozzle arrays An1, An2 are arranged at a predetermined distance along the Y-axis direction.
  • the inkjet head 4 (the head chip 41) in the present embodiment is formed as a two-row type inkjet head (head chip).
  • the nozzle array An1 has a plurality of nozzle holes H1 formed side by side along the X-axis direction at predetermined intervals. These nozzle holes H1 each penetrate the nozzle plate 411 along the thickness direction of the nozzle plate 411 (the Z-axis direction), and are individually communicated with the respective ejection channels C1e in the actuator plate 412 described later as shown in, for example, FIG. 3 , FIG. 4 , and FIG. 6 . Further, the formation pitch along the X-axis direction in the nozzle holes H1 is arranged to be the same (the same pitch) as the formation pitch along the X-axis direction in the ejection channels C1e. Although described later in detail, it is arranged that the ink 9 supplied from the inside of the ejection channel C1e is ejected (jetted) from each of the nozzle holes H1 in such a nozzle array An1.
  • the nozzle array An2 similarly has a plurality of nozzle holes H2 formed side by side along the X-axis direction at predetermined intervals. These nozzle holes H2 each penetrate the nozzle plate 411 along the thickness direction of the nozzle plate 411, and are individually communicated with the respective ejection channels C2e in the actuator plate 412 described later. Further, the formation pitch along the X-axis direction in the nozzle holes H2 is arranged to be the same as the formation pitch along the X-axis direction in the ejection channels C2e. Although described later in detail, it is arranged that the ink 9 supplied from the inside of the ejection channel C2e is also ejected from each of the nozzle holes H2 in such a nozzle array An2.
  • the nozzle holes H1 in the nozzle array An1 and the nozzle holes H2 in the nozzle array An2 are arranged in a staggered manner along the X-axis direction. Therefore, in each of the inkjet heads 4 according to the present embodiment, the nozzle holes H1 in the nozzle array An1 and the nozzle holes H2 in the nozzle array An2 are arranged in a zigzag manner (in a zigzag arrangement). It should be noted that such nozzle holes H1, H2 each have a tapered through hole gradually decreasing in diameter in a downward direction (see FIG. 3 , FIG. 4 , and FIG. 6 ).
  • the nozzle holes H1 adjacent to each other along the X-axis direction are arranged so as to be shifted from each other along the extending direction (the Y-axis direction) of the ejection channels C1e.
  • the whole of the plurality of nozzle holes H1 in the nozzle array An1 is arranged in a zigzag manner along the X-axis direction.
  • the plurality of nozzle holes H1 in the nozzle array An1 includes a plurality of nozzle holes H11 belonging to a nozzle array An11 extending along the X-axis direction and a plurality of nozzle holes H12 belonging to a nozzle array An12 extending along the X-axis direction. Further, each of the nozzle holes H11 is arranged so as to be shifted toward the positive side (on a first supply slit Sin1 side described later) in the Y-axis direction with reference to a central position along the extending direction (the Y-axis direction) of the ejection channels C1e.
  • each of the nozzle holes H12 is arranged so as to be shifted toward the negative side (on a first discharge slit Sout1 side described later) in the Y-axis direction with reference to the central position along the extending direction of the ejection channels C1e.
  • the nozzle holes H2 adjacent to each other along the X-axis direction are arranged so as to be shifted from each other along the extending direction (the Y-axis direction) of the ejection channels C2e.
  • the whole of the plurality of nozzle holes H2 in the nozzle array An2 is arranged in a zigzag manner along the X-axis direction.
  • the plurality of nozzle holes H2 in the nozzle array An2 includes a plurality of nozzle holes H21 belonging to a nozzle array An21 extending along the X-axis direction and a plurality of nozzle holes H22 belonging to a nozzle array An22 extending along the X-axis direction. Further, each of the nozzle holes H21 is arranged so as to be shifted toward the negative side (on a second supply slit side described later) in the Y-axis direction with reference to a central position along the extending direction (the Y-axis direction) of the ejection channels C2e.
  • each of the nozzle holes H22 is arranged so as to be shifted toward the positive side (on a second discharge slit side described later) in the Y-axis direction with reference to the central position along the extending direction of the ejection channels C2e.
  • the nozzle holes H11, H21 described above each correspond to a specific example of a "first nozzle hole” in the present disclosure.
  • the nozzle holes H12, H22 each correspond to a specific example of a "second nozzle hole” in the present disclosure. It should be noted that the details of the arrangement configuration of such nozzle holes H1 (H11, H12), H2 (H21, H22) will be described later.
  • the actuator plate 412 is a plate formed of a piezoelectric material such as PZT (lead zirconate titanate). As shown in FIG. 3 , FIG. 4 , and FIG. 6 , the actuator plate 412 is constituted by stacking two piezoelectric substrates different in polarization direction from each other on one another along the thickness direction (the Z-axis direction) (a so-called chevron type). It should be noted that the configuration of the actuator plate 412 is not limited to the chevron type. Specifically, it is also possible to form the actuator plate 412 with, for example, a single (unique) piezoelectric substrate having the polarization direction set to one direction along the thickness direction (the Z-axis direction) (a so-called cantilever type).
  • PZT lead zirconate titanate
  • the actuator plate 412 is provided with two channel rows (channel rows 421, 422) each extending along the X-axis direction. These channel rows 421, 422 are arranged at a predetermined distance along the Y-axis direction.
  • an ejection area (jetting area) of the ink 9 is disposed in a central part (the formation areas of the channel rows 421, 422) along the X-axis direction.
  • a non-ejection area (non-jetting area) of the ink 9 is disposed in each of the both end parts (non-formation areas of the channel rows 421, 422) along the X-axis direction.
  • the non-ejection areas are each located on the outer side along the X-axis direction with respect to the ejection area described above.
  • the both end parts along the Y-axis direction in the actuator plate 412 each constitute a tail part 420 as shown in FIG. 2 .
  • the channel row 421 described above has the plurality of channels C1. As shown in FIG. 2 , these channels C1 each extend along the Y-axis direction in the actuator plate 412. Further, as shown in FIG. 2 , these channels C1 are arranged side by side so as to be parallel to each other at predetermined intervals along the X-axis direction. Each of the channels C1 is partitioned with drive walls Wd formed of a piezoelectric body (the actuator plate 412), and forms a groove section having a recessed shape in a cross-sectional view of the Z-X cross-sectional surface.
  • the channel row 422 similarly has the plurality of channels C2 each extending along the Y-axis direction. As shown in FIG. 2 , these channels C2 are arranged side by side so as to be parallel to each other at predetermined intervals along the X-axis direction. Each of the channels C2 is also partitioned with the drive walls Wd described above, and forms a groove section having a recessed shape in the cross-sectional view of the Z-X cross-sectional surface.
  • each of the ejection channels C1e is communicated with the nozzle hole H1 in the nozzle plate 411 on the one hand (see FIG. 3 , FIG. 4 , and FIG. 6 ), but each of the dummy channels C1d is not communicated with the nozzle hole H1, and is covered with the upper surface of the nozzle plate 411 (and/or the alignment plate 415) from below on the other hand.
  • the plurality of ejection channels C1e is disposed side by side so that the ejection channels C1e at least partially overlap each other along a predetermined direction (the X-axis direction), and in particular in the example shown in FIG. 2 , the plurality of ejection channels C1e is disposed so as to entirely overlap each other along the X-axis direction.
  • a predetermined direction the X-axis direction
  • the plurality of ejection channels C1e is disposed so as to entirely overlap each other along the X-axis direction.
  • the whole of the plurality of ejection channels C1e is arranged in a row along the X-axis direction.
  • the plurality of dummy channels C1d is arranged side by side along the X-axis direction, and in the example shown in FIG.
  • the whole of the plurality of dummy channels C1d is arranged in a row along the X-axis direction. Further, in the channel row 421, the ejection channels C1e and the dummy channels C1d described above are alternately arranged along the X-axis direction (see FIG. 2 ).
  • each of the ejection channels C2e is communicated with the nozzle hole H2 in the nozzle plate 411 on the one hand, but each of the dummy channels C2d is not communicated with the nozzle hole H2, and is covered with the upper surface of the nozzle plate 411 (and/or the alignment plate 415) from below on the other hand (see FIG. 3 and FIG. 4 ).
  • the plurality of ejection channels C2e is disposed side by side so that the ejection channels C2e at least partially overlap each other along a predetermined direction (the X-axis direction), and in particular in the example shown in FIG. 2 , the plurality of ejection channels C2e is disposed so as to entirely overlap each other along the X-axis direction.
  • a predetermined direction the X-axis direction
  • the plurality of ejection channels C2e is disposed so as to entirely overlap each other along the X-axis direction.
  • the whole of the plurality of ejection channels C2e is arranged in a row along the X-axis direction.
  • the plurality of dummy channels C2d is arranged side by side along the X-axis direction, and in the example shown in FIG.
  • the whole of the plurality of dummy channels C2d is arranged in a row along the X-axis direction. Further, in the channel row 422, the ejection channels C2e and the dummy channels C2d described above are alternately arranged along the X-axis direction (see FIG. 2 ).
  • ejection channels C1e, C2e each correspond to a specific example of the "ejection groove” in the present disclosure.
  • the X-axis direction corresponds to a specific example of a "predetermined direction” in the present disclosure
  • the Y-axis direction corresponds to a specific example of an "extending direction of the ejection groove” in the present disclosure.
  • the ejection channel C1e in the channel row 421 and the dummy channel C2d in the channel row 422 are arranged in alignment with each other along the extending direction (the Y-axis direction) of the ejection channel C1e and the dummy channel C2d. Further, as shown in FIG. 2 , the dummy channel C1d in the channel row 421 and the ejection channel C2e in the channel row 422 are arranged in alignment with each other along the extending direction (the Y-axis direction) of the dummy channel C1d and the ejection channel C2e.
  • the ejection channels C1e each have arc-like side surfaces with which the cross-sectional area of each of the ejection channels C1e gradually decreases in a direction from the cover plate 413 side (upper side) toward the nozzle plate 411 side (lower side).
  • the ejection channels C2e each have arc-like side surfaces with which the cross-sectional area of each of the ejection channels C2e gradually decreases in the direction from the cover plate 413 side toward the nozzle plate 411 side. It should be noted that it is arranged that the arc-like side surfaces of such ejection channels C1e, C2e are each formed by, for example, cutting work using a dicer.
  • drive electrodes Ed extending along the Y-axis direction are respectively disposed on inner side surfaces opposed to each other along the X-axis direction in each of the drive walls Wd described above.
  • the drive electrodes Ed there exist common electrodes Edc disposed on inner side surfaces facing the ejection channels C1e, C2e, and individual electrodes (active electrodes) Eda disposed on the inner side surfaces facing the dummy channels C1d, C2d.
  • the drive electrodes Ed (the common electrodes Edc and the active electrodes Eda) described above are each formed in the entire area in the depth direction (the Z-axis direction) on the inner side surface of the drive wall Wd (see FIG. 3 and FIG. 4 ).
  • the pair of common electrodes Edc opposed to each other in the same ejection channel C1e (or the same ejection channel C2e) are electrically connected to each other in a common terminal (a common interconnection) not shown. Further, the pair of individual electrodes Eda opposed to each other in the same dummy channel C1d (or the same dummy channel C2d) are electrically separated from each other. In contrast, the pair of individual electrodes Eda opposed to each other via the ejection channel C1e (or the ejection channel C2e) are electrically connected to each other in an individual terminal (an individual interconnection) not shown.
  • the flexible printed circuit board described above for electrically connecting the drive electrodes Ed and the circuit board described above to each other.
  • Interconnection patterns (not shown) provided to the flexible printed circuit board are electrically connected to the common interconnections and the individual interconnections described above.
  • a drive voltage is applied to each of the drive electrodes Ed from the drive circuit on the circuit board described above via the flexible printed circuit board.
  • an end part along the extending direction (the Y-axis direction) of each of the dummy channels C1d, C2d has the following configuration.
  • each of the dummy channels C1d, C2d one side along the extending direction thereof has an arc-like side surface with which the cross-sectional area of each of the dummy channels C1d, C2d gradually decreases in a direction toward the nozzle plate 411 (see FIG. 3 and FIG. 4 ).
  • the arc-like side surfaces in such dummy channels C1d, C2d are each formed by, for example, the cutting work with the dicer similarly to the arc-like side surfaces in the ejection channels C1e, C2e described above.
  • each of the individual electrodes Eda disposed so as to be opposed to each other on the both side surfaces along the X-axis direction in each of the dummy channels C1d, C2d also extends up to the end part along the Y-axis direction in the actuator plate 412.
  • the cover plate 413 is disposed so as to close the channels C1, C2 (the channel rows 421, 422) in the actuator plate 412. Specifically, the cover plate 413 is bonded to the upper surface of the actuator plate 412, and has a plate-like structure.
  • the cover plate 413 is provided with a pair of entrance side common flow channels Rin1, Rin2, a pair of exit side common flow channels Rout1, Rout2, and wall parts W1, W2.
  • the wall part W1 is disposed so as to cover above the ejection channels C1e and the dummy channels C1d
  • the wall part W2 is disposed so as to cover above the ejection channels C2e and the dummy channels C2d (see FIG. 3 and FIG. 4 ).
  • the entrance side common flow channels Rin1, Rin2 and the exit side common flow channels Rout1, Rout2 each extend along the X-axis direction, and are arranged side by side so as to be parallel to each other at predetermined distance along the X-axis direction as shown in, for example, FIG. 5 .
  • the entrance side common flow channel Rin1 and the exit side common flow channel Rout1 are each formed in an area corresponding to the channel row 421 (the plurality of channels C1) in the actuator plate 412 (see FIG. 3 through FIG. 5 ).
  • the entrance side common flow channel Rin2 and the exit side common flow channel Rout2 are each formed in an area corresponding to the channel row 422 (the plurality of channels C2) in the actuator plate 412 (see FIG. 3 and FIG. 4 ).
  • the entrance side common flow channel Rin1 is formed in the vicinity of an inner end part along the Y-axis direction in each of the channels C1, and forms a groove section having a recessed shape (see FIG. 3 through FIG. 5 ).
  • first supply slits Sin1 penetrating the cover plate 413 along the thickness direction (the Z-axis direction) of the cover plate 413 (see FIG. 3 through FIG. 5 ).
  • the entrance side common flow channel Rin2 is formed in the vicinity of an inner end part along the Y-axis direction in each of the channels C2, and forms a groove section having a recessed shape (see FIG. 3 and FIG. 4 ).
  • second supply slits (not shown) penetrating the cover plate 413 along the thickness direction of the cover plate 413, respectively.
  • first supply slits Sin1 and the second supply slits each correspond to a specific example of a "first through hole" in the present disclosure.
  • the exit side common flow channel Rout1 is formed in the vicinity of an outer end part along the Y-axis direction in each of the channels C1, and forms a groove section having a recessed shape (see FIG. 3 through FIG. 5 ).
  • first discharge slits Sout1 penetrating the cover plate 413 along the thickness direction of the cover plate 413
  • the exit side common flow channel Rout2 is formed in the vicinity of an outer end part along the Y-axis direction in each of the channels C2, and forms a groove section having a recessed shape (see FIG. 3 and FIG. 4 ).
  • second discharge slits (not shown) penetrating the cover plate 413 along the thickness direction of the cover plate 413, respectively.
  • first discharge slits Sout1 and the second discharge slits each correspond to a specific example of a "second through hole" in the present disclosure.
  • the first supply slit Sin1 and the first discharge slit Sout1 in each of the ejection channels C1e described above form a first slit pair Sp1.
  • the first supply slit Sin1 and the first discharge slit Sout1 are disposed side by side along the extending direction (the Y-axis direction) of the ejection channel C1e.
  • the second supply slit and the second discharge slit in each of the ejection channels C2e form a second slit pair (not shown).
  • the second supply slit and the second discharge slit are disposed side by side along the extending direction (the Y-axis direction) of the ejection channel C2e.
  • the entrance side common flow channel Rin1 and the exit side common flow channel Rout1 are communicated with each of the ejection channels C1e via the first supply slit Sin1 and the first discharge slit Sout1, respectively (see FIG. 3 through FIG. 5 ).
  • the entrance side common flow channel Rin1 is a common flow channel communicated with each of the first supply slits Sin1 of the respective first slit pairs Sp1 described above, and the exit side common flow channel Rout1 forms a common flow channel communicated with each of the first discharge slits Sout1 of the respective first slit pairs Sp1 (see FIG. 5 ).
  • the first supply slit Sin1 and the first discharge slit Sout1 each form a through hole through which the ink 9 flows to and from the ejection channel C1e.
  • the first supply slit Sin1 is a through hole for making the ink 9 inflow into the ejection channel C1e
  • the first discharge slit Sout1 is a through hole for making the ink 9 outflow from the inside of the ejection channel C1e.
  • neither the entrance side common flow channel Rin1 nor the exit side common flow channel Rout1 is communicated with the dummy channels C1d.
  • each of the dummy channels C1d is arranged to be closed by bottom parts in the entrance side common flow channel Rin1 and the exit side common flow channel Rout1.
  • the entrance side common flow channel Rin2 and the exit side common flow channel Rout2 are communicated with each of the ejection channels C2e via the second supply slit and the second discharge slit, respectively.
  • the entrance side common flow channel Rin2 is a common flow channel communicated with each of the second supply slits of the respective second slit pairs described above
  • the exit side common flow channel Rout2 forms a common flow channel communicated with each of the second discharge slits of the respective second slit pairs.
  • the second supply slit and the second discharge slit each form a through hole through which the ink 9 flows to and from the ejection channel C2e.
  • the second supply slit is a through hole for making the ink 9 inflow into the ejection channel C2e
  • the second discharge slit forms a through hole for making the ink 9 outflow from the inside of the ejection channel C2e.
  • neither the entrance side common flow channel Rin2 nor the exit side common flow channel Rout2 is communicated with the dummy channels C2d (see FIG. 3 and FIG. 4 ).
  • each of the dummy channels C2d is arranged to be closed by bottom parts in the entrance side common flow channel Rin2 and the exit side common flow channel Rout2 (see FIG. 3 and FIG. 4 ).
  • the alignment plate 415 is disposed between the actuator plate 412 and the nozzle plate 411.
  • the alignment plate 415 has a plurality of opening parts H31, H32 for performing the alignment of the nozzle holes H1, H2 when manufacturing the head chip 41 for the respective nozzle holes H1 (H11, H12), H2 (H21, H22).
  • the opening part H31 is disposed for each of the nozzle holes H11, H21, and at the same time, the opening part H32 is disposed for each of the nozzle holes H12, H22 (see FIG. 3 , FIG. 4 , and FIG. 6 ).
  • opening parts H31, H32 respectively communicate the nozzle holes H11, H12, H21, and H22 with the ejection channels C1e1, C1e2, and each form an opening part having a roughly rectangular shape on the X-Y plane.
  • the length (the opening length) in the Y-axis direction in each of the opening parts H31, H32 is made longer than the length in the Y-axis direction in each of the nozzle holes H11, H12, H21, and H22 (see FIG. 3 and FIG. 4 ).
  • the length in the X-axis direction in each of the opening parts H31, H32 is made longer than the length in the X-axis direction in each of the nozzle holes H11, H12, H21, and H22, and the length in the X-axis direction in each of the ejection channels C1e, C2e (see FIG. 6 ).
  • a small amount of positional error (a positional error in the X-Y plane) in the nozzle holes H1, H2 is tolerated due to such opening parts H31, H32 to thereby prevent such a positional error. Since such an alignment plate 415 is provided, it becomes easy to achieve the alignment between the actuator plate 412 and the nozzle plate 411 when manufacturing the head chip 41.
  • opening parts H31, H32 each correspond to a specific example of a "third through hole” in the present disclosure.
  • expansion flow channel parts 431, 432 described below are formed so as to include the opening parts H31, H32 in such an alignment plate 415, respectively.
  • the expansion flow channel part 431 is formed in the vicinity of the nozzle hole H11, H21, and forms a flow channel for expanding the cross-sectional area (the flow channel cross-sectional area Sf3) of the flow channel of the ink 9 in the vicinity of the nozzle hole H11, H21 although described later in detail (see, e.g., FIG. 3 ).
  • the expansion flow channel part 432 is formed in the vicinity of the nozzle hole H12, H22, and forms a flow channel for expanding the cross-sectional area (the flow channel cross-sectional area Sf4) of the flow channel of the ink 9 in the vicinity of the nozzle hole H12, H22 although described later in detail (see, e.g., FIG. 4 ).
  • expansion flow channel part 431 corresponds to a specific example of a "first expansion flow channel part” in the present disclosure.
  • expansion flow channel part 432 corresponds to a specific example of a "second expansion flow channel part” in the present disclosure.
  • flow channel cross-sectional area Sf3 described above corresponds to a specific example of a "third cross-sectional area” in the present disclosure.
  • flow channel cross-sectional area Sf4 described above corresponds to a specific example of a "fourth cross-sectional area” in the present disclosure.
  • the plurality of nozzle holes H1 includes the two types of nozzle holes H11, H12, and at the same time, the plurality of nozzle holes H2 includes the two types of nozzle holes H21, H22 (see FIG. 2 ).
  • a central position Pn11 of each of the nozzle holes H11 is disposed so as to be shifted toward the positive side (on the first supply slit Sin1 side) in the Y-axis direction with reference to a central position Pc1 (i.e., a central position along the Y-axis direction of the wall part W1) along the extending direction (the Y-axis direction) of the ejection channels C1e (see FIG. 3 and FIG. 5 ).
  • a central position of each of the nozzle holes H21 is disposed so as to be shifted toward the negative side (on the second supply slit side) in the Y-axis direction with reference to a central position (i.e., a central position along the Y-axis direction of the wall part W2) along the extending direction (the Y-axis direction) of the ejection channels C2e (see FIG. 2 ).
  • each of the nozzle holes H12 is disposed so as to be shifted toward the negative side (on the first discharge slit Sout1 side) in the Y-axis direction with reference to the central position Pc1 along the extending direction of the ejection channels C1e (see FIG. 4 and FIG. 5 ).
  • a central position of each of the nozzle holes H22 is disposed so as to be shifted toward the positive side (on the second discharge slit side) in the Y-axis direction with reference to a central position along the extending direction (the Y-axis direction) of the ejection channels C2e (see FIG. 2 ).
  • the cross-sectional area (the cross-sectional area Sfin1 of the first entrance side flow channel) of the flow channel of the ink 9 in a part communicated with the first supply slit Sin1 is made smaller than the cross-sectional area (the cross-sectional area Sfout1 of the first exit side flow channel) of the flow channel of the ink 9 in a part communicated with the first discharge slit Sout1 (Sfin1 ⁇ Sfout1; see FIG. 3 ).
  • the cross-sectional area (the cross-sectional area of the second entrance side flow channel) of the flow channel of the ink 9 in a part communicated with the second supply slit is made smaller than the cross-sectional area (the cross-sectional area of the second exit side flow channel) of the flow channel of the ink 9 in a part communicated with the second discharge slit (Sfin2 ⁇ Sfout2).
  • the cross-sectional area Sfout1 of the first exit side flow channel described above is made smaller than the cross-sectional area Sfin1 of the first entrance side flow channel described above (Sfout1 ⁇ Sfin1; see FIG. 4 ).
  • the cross-sectional area Sfout2 of the second exit side flow channel described above is also made smaller than the cross-sectional area Sfin2 of the second entrance side flow channel described above (Sfout2 ⁇ Sfin2).
  • the ejection channels C1e1 described above and the ejection channels C2e communicated with the nozzle holes H21 each correspond to a specific example of a "first ejection groove" in the present disclosure.
  • the ejection channels C1e2 described above and the ejection channels C2e communicated with the nozzle holes H22 each correspond to a specific example of a "second ejection groove” in the present disclosure.
  • the cross-sectional area Sfin1 of the first entrance side flow channel and the cross-sectional area of the second entrance side flow channel described above each correspond to a specific example of a "first cross-sectional area" in the present disclosure.
  • the cross-sectional area Sfout1 of the first exit side flow channel and the cross-sectional area of the second exit side flow channel described above each correspond to a specific example of a "second cross-sectional area" in the present disclosure.
  • the central position Pn11 of the nozzle hole H11 described above and the central position of the nozzle hole H21 each correspond to a specific example of a "first central position” in the present disclosure.
  • the central position Pn12 of the nozzle hole H12 described above and the central position of the nozzle hole H22 each correspond to a specific example of a "second central position" in the present disclosure.
  • the length (a first pump length Lw1; see FIG. 3 and FIG. 4 ) in the extending direction (the Y-axis direction) of the ejection channel C1e corresponding to a distance between the first supply slit Sin1 and the first discharge slit Sout1 in the first slit pair Sp1 described above is made the same in all of the first slit pairs Sp1 (see FIG. 5 ).
  • the length (a second pump length) in the extending direction (the Y-axis direction) of the ejection channel C2e corresponding to a distance between the second supply slit and the second discharge slit in the second slit pair described above is also made the same in all of the second slit pairs.
  • the magnitude relationship between the length (a first supply slit length Lin1) in the Y-axis direction in the first supply slit Sin1 and the length (a first discharge slit length Lout1) in the Y-axis direction in the first discharge slit Sout1 is alternately flipped between the first slit pairs Sp1 adjacent to each other along the X-axis direction (see FIG. 5 ).
  • the magnitude relationship of (Lin1>Lout1) in a certain first slit pair Sp1 there is a magnitude relationship of (Lin1 ⁇ Lout1) on the contrary in each of the first slit pairs Sp1 located on both sides of that first slit pair Sp1.
  • a magnitude relationship between the length (a second supply slit length) in the Y-axis direction in the second supply slit and the length (a second discharge slit length) in the Y-axis direction in the second discharge slit is also alternately flipped in such a manner as described above between the second slit pairs adjacent to each other along the X-axis direction.
  • the length (the first entrance side flow channel width Win1) in the Y-axis direction in the entrance side common flow channel Rin1 is made constant along the extending direction (the X-axis direction) of the entrance side common flow channel Rin1 (see FIG. 5 ). Further, the length (the first exit side flow channel width Wout1) in the Y-axis direction in the exit side common flow channel Rout1 is also made constant along the extending direction (the X-axis direction) of the exit side common flow channel Rout1 (see FIG. 5 ).
  • the length (the second entrance side flow channel width) in the Y-axis direction in the entrance side common flow channel Rin2 is also made constant along the extending direction (the X-axis direction) of the entrance side common flow channel Rin2.
  • the length (the second exit side flow channel width) in the Y-axis direction in the exit side common flow channel Rout2 is also made constant along the extending direction (the X-axis direction) of the exit side common flow channel Rout2.
  • FIG. 7 and FIG. 8 are each a cross-sectional view (a Y-Z cross-sectional view) schematically showing an example of a positional relationship between the nozzle holes H1, H2 and the expansion flow channel part related to the present embodiment and so on.
  • FIG. 7(A) is a diagram showing a cross-sectional configuration in the vicinity of a part denoted by the symbol VII in FIG. 3 in an enlarged manner
  • FIG. 7(A) is a diagram showing a cross-sectional configuration in the vicinity of a part denoted by the symbol VII in FIG. 3 in an enlarged manner
  • FIG. 7(B) is a diagram showing a cross-sectional configuration in an inkjet head 304 (a head chip 300) according to Comparative Example 3 described later in comparison with FIG. 7(A) .
  • FIG. 8(A) is a diagram showing a cross-sectional configuration in the vicinity of a part denoted by the symbol VIII in FIG. 4 in an enlarged manner
  • FIG. 8(B) is a diagram showing a cross-sectional configuration in an inkjet head 404 (a head chip 400) according to Comparative Example 4 described later in comparison with FIG. 8(A) .
  • both end parts along the Y-axis direction in these expansion flow channel parts 431, 432 are located on the inner side (in a so-called pump chamber) of both end parts along the Y-axis direction in the wall part W1 (or the wall part W2) (see FIG. 3 and FIG. 4 ).
  • the end of the expansion flow channel part 431 on the first supply slit Sin1 side is disposed on the first discharge slit Sout1 side of the reference position. Further, defining the end of the wall part W1 on the first discharge slit Sout1 side as a reference position, the end of the expansion flow channel part 431 on the first discharge slit Sout1 side is also disposed on the first supply slit Sin1 side of the reference position.
  • the end of the expansion flow channel part 431 on the second supply slit side is disposed on the second discharge slit side described above of the reference position. Further, defining the end of the wall part W2 on the second discharge slit side as a reference position, the end of the expansion flow channel part 431 on the second discharge slit side is also disposed on the second supply slit side of the reference position.
  • the end of the expansion flow channel part 432 on the first discharge slit Sout1 side is disposed on the first supply slit Sin1 side of the reference position. Further, defining the end of the wall part W1 on the first supply slit Sin1 side as a reference position, the end of the expansion flow channel part 432 on the first supply slit Sin1 side is also disposed on the first discharge slit Sout1 side of the reference position.
  • the end of the expansion flow channel part 432 on the second discharge slit side is disposed on the second supply slit side of the reference position. Further, defining the end of the wall part W2 on the second supply slit side as a reference position, the end of the expansion flow channel part 432 on the second supply slit side is also disposed on the second discharge slit side of the reference position.
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 431 is shifted toward the first supply slit Sin1 along the Y-axis direction from the central position Pn11 of the nozzle hole H11.
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 431 is shifted toward the second supply slit along the Y-axis direction from the central position of the nozzle hole H21.
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 301 is shifted in the opposite direction toward the first discharge slit Sout1 along the Y-axis direction from the central position Pn11 of the nozzle hole H11.
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 301 is shifted in the opposite direction toward the second discharge slit along the Y-axis direction from the central position of the nozzle hole H21.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 432 is shifted toward the first discharge slit Sout1 along the Y-axis direction from the central position Pn12 of the nozzle hole H12.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 432 is shifted toward the second discharge slit along the Y-axis direction from the central position of the nozzle hole H22.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 402 is shifted in the opposite direction toward the first supply slit Sin1 along the Y-axis direction from the central position Pn12 of the nozzle hole H12.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 402 is shifted in the opposite direction toward the second supply slit along the Y-axis direction from the central position of the nozzle hole H22.
  • a recording operation (a printing operation) of images, characters, and so on to the recording paper P is performed in the following manner.
  • the four types of ink tanks 3 (3Y, 3M, 3C, and 3K) shown in FIG. 1 are sufficiently filled with the ink 9 of the corresponding colors (the four colors), respectively.
  • the inkjet heads 4 are filled with the ink 9 in the ink tanks 3 via the circulation channel 50, respectively.
  • the grit rollers 21 in the carrying mechanisms 2a, 2b each rotate to thereby carry the recording paper P along the carrying direction d (the X-axis direction) between the grit rollers 21 and the pinch rollers 22.
  • the drive motor 633 in the drive mechanism 63 rotates each of the pulleys 631a, 631b to thereby operate the endless belt 632.
  • the carriage 62 reciprocates along the width direction (the Y-axis direction) of the recording paper P while being guided by the guide rails 61a, 61b.
  • the four colors of ink 9 are appropriately ejected on the recording paper P by the respective inkjet heads 4 (4Y, 4M, 4C, and 4K) to thereby perform the recording operation of images, characters, and so on to the recording paper P.
  • the drive circuit on the circuit board described above applies the drive voltage to the drive electrodes Ed (the common electrodes Edc and the individual electrodes Eda) in the inkjet head 4 via the flexible printed circuit boards described above.
  • the drive circuit applies the drive voltage to the drive electrodes Ed disposed on the pair of drive walls Wd forming the ejection channel C1e, C2e.
  • the pair of drive walls Wd each deform so as to protrude toward the dummy channel C1d, C2d adjacent to the ejection channel C1e, C2e.
  • the configuration of the actuator plate 412 is made to be the chevron type described above, by applying the drive voltage using the drive circuit described above, it results that the drive wall Wd makes a flexion deformation to have a V shape centering on an intermediate position in the depth direction in the drive wall Wd. Further, due to such a flexion deformation of the drive wall Wd, the ejection channel C1e, C2e deforms as if the ejection channel C1e, C2e bulges.
  • the drive wall Wd makes the flexion deformation to have the V shape in the following manner. That is, in the case of the cantilever type, since it results that the drive electrode Ed is attached by the oblique evaporation to an upper half in the depth direction, by the drive force being exerted only on the part provided with the drive electrode Ed, the drive wall Wd makes the flexion deformation (in the end part in the depth direction of the drive electrode Ed).
  • the volume of the ejection channel C1e, C2e increases. Further, due to the increase in the volume of the ejection channel C1e, C2e, it results that the ink 9 retained in the entrance side common flow channel Rin1, Rin2 is induced into the ejection channel C1e, C2e.
  • the ink 9 having been induced into the ejection channel C1e, C2e in such a manner turns to a pressure wave to propagate to the inside of the ejection channel C1e, C2e.
  • the drive voltage to be applied to the drive electrodes Ed becomes 0 (zero) V at the timing (or the timing in the vicinity of the timing) at which the pressure wave has reached the nozzle hole H1, H2 of the nozzle plate 411.
  • the drive walls Wd are restored from the state of the flexion deformation described above, and as a result, the volume of the ejection channel C1e, C2e having once increased is restored again.
  • the internal pressure of the ejection channel C1e, C2e increases, and the ink 9 in the ejection channel C1e, C2e is pressurized.
  • the ink 9 having a droplet shape is ejected (see FIG. 3 , FIG. 4 , and FIG. 6 ) toward the outside (toward the recording paper P) through the nozzle hole H1, H2.
  • the jet operation (the ejection operation) of the ink 9 in the inkjet head 4 is performed in such a manner, and as a result, the recording operation of images, characters, and so on to the recording paper P is performed.
  • the ink 9 is fed by the liquid feeding pump described above from the inside of the ink tank 3 to the inside of the flow channel 50a. Further, the ink 9 flowing through the flow channel 50b is fed by the liquid feeding pump described above to the inside of the ink tank 3.
  • the ink 9 flowing from the inside of the ink tank 3 via the flow channel 50a inflows into the entrance side common flow channels Rin1, Rin2.
  • the ink 9 having been supplied to these entrance side common flow channels Rin1, Rin2 is supplied to the ejection channels C1e, C2e in the actuator plate 412 via the first supply slit Sin1 and the second supply slit, respectively (see FIG. 3 and FIG. 4 ).
  • the ink 9 in the ejection channels C1e, C2e flows into the exit side common flow channels Rout1, Rout2 via the first discharge slit Sout1 and the second discharge slit, respectively (see FIG. 3 and FIG. 4 ).
  • the ink 9 supplied to these exit side common flow channels Rout1, Rout2 is discharged to the flow channel 50b to thereby outflow from the inside of the inkjet head 4.
  • the ink 9 having been discharged to the flow channel 50b is returned to the inside of the ink tank 3 as a result. In such a manner, the circulation operation of the ink 9 via the circulation channel 50 is achieved.
  • the inkjet head of a type other than the circulation type when using fast drying ink, there is a possibility that a local increase in viscosity or local solidification of the ink occurs due to drying of the ink in the vicinity of the nozzle hole, and as a result, a failure such as an ink ejection failure occurs.
  • the inkjet heads 4 the circulation type inkjet heads according to the present embodiment, since the fresh ink 9 is always supplied to the vicinity of the nozzle holes H1, H2, the failure such as the ink ejection failure described above is avoided as a result.
  • FIG. 9 is a bottom view (an X-Y bottom view) schematically showing a configuration example of the inkjet head 104 according to Comparative Example 1 in the state in which a nozzle plate 101 (described later) according to Comparative Example 1 is detached.
  • FIG. 10 is a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of the inkjet head 104 according to Comparative Example 1 along the line X-X shown in FIG. 9 .
  • the inkjet head 104 (the head chip 100) according to Comparative Example 1 differs in arrangement configuration of the nozzle holes H1, H2 from the inkjet head 4 (the head chip 41) according to the present embodiment.
  • nozzle holes H1, H2 in respective nozzle arrays An101, An102 are each arranged in a row along the extending direction (the X-axis direction) of the nozzle arrays An101, An102 (see FIG. 9 ).
  • the central position Pn1 of each of the nozzle holes H1 coincides with the central position Pc1 (i.e., the central position along the Y-axis direction of the wall part W1) along the extending direction (the Y-axis direction) of the ejection channel C1e (see FIG. 10 ).
  • Comparative Example 1 it is arranged that the central position of each of the nozzle holes H2 coincides with the central position (i.e., the central position along the Y-axis direction of the wall part W2) along the extending direction (the Y-axis direction) of the ejection channel C2e.
  • FIG. 11 and FIG. 12 are each a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of an inkjet head 204 (a head chip 200) according to Comparative Example 2.
  • FIG. 11 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H11 (the ejection channel C1e1) in the inkjet head 204 according to Comparative Example 2, and corresponds to FIG. 3 in the present embodiment.
  • FIG. 12 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H12 (the ejection channel C1e2) in the inkjet head 204 according to Comparative Example 2, and corresponds to FIG. 4 in the present embodiment.
  • the inkjet head 204 (the head chip 200) according to Comparative Example 2 corresponds to a configuration obtained by omitting the alignment plate 415 (the expansion flow channels 431, 432) described above in the inkjet head 4 (the head chip 41) according to the present embodiment (see FIG. 3 and FIG. 4 ).
  • Comparative Example 2 the following results in substantially the same manner as in the present embodiment unlike Comparative Example 1. That is, the central position Pn11 of the nozzle hole H11 is disposed so as to be shifted toward the first supply slit Sin1 with reference to the central position Pc1 along the extending direction (the Y-axis direction) of the ejection channel C1e, and at the same time, the central position Pn12 of the nozzle hole H12 is disposed so as to be shifted toward the first discharge slit Sout1 with reference to the central position Pc1 described above.
  • the central position of the nozzle hole H21 is disposed so as to be shifted toward the second supply slit with reference to the central position along the extending direction (the Y-axis direction) of the ejection channel C2e, and at the same time, the central position of the nozzle hole H22 is disposed so as to be shifted toward the second discharge slit with reference to the central position along the extending direction of the ejection channel C2e.
  • Comparative Example 2 the distance between the nozzle holes H1 adjacent to each other (and the distance between the nozzle holes H2 adjacent to each other) becomes longer compared to (Comparative Example 1 described above) when the nozzle holes H1, H2 are each arranged in a row along the X-axis direction. Therefore, since the distance between the droplets which are jetted around the same time and flying toward the recording target medium (e.g., the recording paper P) increases, it is possible to relax the local concentration of the droplets flying between the nozzle holes H1, H2 and the recording target medium.
  • the recording target medium e.g., the recording paper P
  • Comparative Example 2 the influence (the generation of the air current) on each of the droplets thus flying can be suppressed, and as a result, it is possible to suppress the occurrence of the wood-effect unevenness in concentration on the recording target medium described above compared to Comparative Example 1.
  • the cross-sectional area Sfin1 of the first entrance side flow channel is made smaller than the cross-sectional area Sfout1 of the first exit side flow channel, and at the same time, in the ejection channels C1e2, the cross-sectional area Sfout1 of the first exit side flow channel is made smaller than the cross-sectional area Sfin1 of the first entrance side flow channel.
  • the flow channel cross-sectional area of the ink 9 has substantially the same magnitude relationship.
  • the degradation in ejection characteristics of the ink 9 due to such a difference in pressure can occur in substantially the same manner between the ejection channels C2e communicated with the respective nozzle holes H21 and the ejection channels C2e communicated with the respective nozzle holes H22.
  • the central position Pn11 of the nozzle hole H11 is disposed so as to be shifted toward the first supply slit Sin1 with reference to the central position Pc1 along the extending direction (the Y-axis direction) of the ejection channel C1e, and at the same time, the central position Pn12 of the nozzle hole H12 is disposed so as to be shifted toward the first discharge slit Sout1 with reference to the central position Pc1 described above.
  • the central position of the nozzle hole H21 is disposed so as to be shifted toward the second supply slit with reference to the central position along the extending direction (the Y-axis direction) of the ejection channel C2e, and at the same time, the central position of the nozzle hole H22 is disposed so as to be shifted toward the second discharge slit with reference to the central position along the extending direction of the ejection channel C2e.
  • Comparative Example 1 the following results compared to Comparative Example 1 in substantially the same manner as in Comparative Example 2. That is, the distance between the nozzle holes H1 adjacent to each other (and the distance between the nozzle holes H2 adjacent to each other) becomes longer compared to (Comparative Example 1) when the nozzle holes H1, H2 are each arranged in a row along the X-axis direction. Therefore, since the distance between the droplets which are jetted around the same time and flying toward the recording target medium (e.g., the recording paper P) increases, it is possible to relax the local concentration of the droplets flying between the nozzle holes H1, H2 and the recording target medium.
  • the recording target medium e.g., the recording paper P
  • the influence (the generation of the air current) on each of the droplets thus flying can be suppressed, and as a result, it is possible to suppress the occurrence of the wood-effect unevenness in concentration on the recording target medium described above compared to Comparative Example 1.
  • the whole of the plurality of ejection channels C1e (and the whole of the plurality of ejection channels C2e) is arranged inside the actuator plate 412 in a row along the X-axis direction in substantially the same manner as in Comparative Example 2.
  • the existing structure is maintained in the whole of the plurality of ejection channels C1e (and the whole of the plurality of ejection channels C2e), and as a result, it becomes easy to form the ejection channels C1e (and the ejection channels C2e).
  • the expansion flow channel parts 431, 432 described above are provided to the head chip 41.
  • the expansion flow channel part 431 for expanding the cross-sectional area (the flow channel cross-sectional area Sf3) of the flow channel of the ink 9 in the vicinity of the nozzle hole H11, H21 is formed in the vicinity of the nozzle hole H11, H21 (see FIG. 3 ).
  • the expansion flow channel part 432 for expanding the cross-sectional area (the flow channel cross-sectional area Sf4) of the flow channel of the ink 9 in the vicinity of the nozzle hole H12, H22 is formed in the vicinity of the nozzle hole H12, H22 (see FIG. 4 ).
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 431 is shifted toward the first supply slit Sin1 along the Y-axis direction from the central position Pn11 of the nozzle hole H11 (see FIG. 7(A) ).
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 431 is shifted toward the second supply slit along the Y-axis direction from the central position of the nozzle hole H21.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 432 is shifted toward the first discharge slit Sout1 along the Y-axis direction from the central position Pn12 of the nozzle hole H12 (see FIG. 8(A) ).
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 432 is shifted toward the second discharge slit along the Y-axis direction from the central position of the nozzle hole H22.
  • Comparative Example 4 for example, as described above, the central position Ph32 along the Y-axis direction in the expansion flow channel part 402 is shifted in the opposite direction toward the first supply slit Sin1 along the Y-axis direction from the central position Pn12 of the nozzle hole H12 (see FIG. 8(B) ). Therefore, in Comparative Example 3 and Comparative Example 4, for example, the difference in pressure in the steady state in the vicinity of the nozzle hole H11, H12 between the ejection channels C1e1 and the ejection channels C1e2 becomes even larger, and the head value margin described above further decreases. Therefore, there is a possibility that the ejection characteristics of the ink 9 further degrade.
  • the inkjet head 4 (the head chip 41) according to the present embodiment, it becomes possible to improve the print image quality while suppressing the manufacturing cost of the head chip 41 compared to Comparative Example 1 through Comparative Example 4 described above. Further, in the present embodiment, it also becomes possible to eject the ink 9 high in viscosity (high-viscosity ink).
  • the expansion flow channel parts 431, 432 are configured so as to respectively include the opening parts H31, H32 (the opening parts for performing the alignment of each of the nozzle holes H1, H2) in the alignment plate 415, the following results. That is, it is possible to easily and accurately form the expansion flow channel parts 431, 432 using the existing opening parts H31, H32 in the alignment plate 415, respectively. Therefore, it becomes possible to further improve the ejection characteristics of the ink 9 to thereby further improve the print image quality while further suppressing the manufacturing cost of the head chip 41.
  • the both end parts along the Y-axis direction in the expansion flow channel parts 431, 432 are located on the inner side (in the pump chamber) of the both end parts along the Y-axis direction in the wall part W1 (or the wall part W2) (see FIG. 3 and FIG. 4 ), the following results. That is, the unevenness in the pressure characteristic decreases in, for example, the inside of the ejection channels C1e1, C1e2, and thus, the ejection characteristics of the ink 9 are further improved, and as a result, it becomes possible to further improve the print image quality.
  • the nozzle holes H1 adjacent to each other (and the nozzle holes H2 adjacent to each other) along the X-axis direction are arranged so as to be shifted from each other along the Y-axis direction while maintaining the existing structure in the whole of the plurality of ejection channels C1e (and the whole of the plurality of ejection channels C2e) in such a manner as described above, it is also possible to achieve the following in substantially the same manner as in the existing structure. In other words, it is possible to make uniform (commonalize) each of the first pump length Lw1 and the second pump length in all of the first slit pairs Sp1 and all of the second slit pairs.
  • a variation in the ejection characteristics between the nozzle holes H1 adjacent to each other (and the nozzle holes H2 adjacent to each other) can be suppressed, and as a result, it becomes possible to further improve the print image quality. Further, in the present embodiment, the following results compared to when arranging the first supply slits Sin1 and the second supply slits in a zigzag manner along the X-axis direction, and arranging the first discharge slits Sout1 and the second discharge slits in a zigzag manner along the X-axis direction.
  • the whole of the plurality of ejection channels C1e (and the whole of the plurality of ejection channels C2e) is also arranged in a zigzag manner along the X-axis direction.
  • the workability of the head chip 41 becomes good (it becomes possible to process the head chip 41 while maintaining the existing manufacturing process).
  • the flow channel widths (the first entrance side flow channel width Win1 and the second entrance side flow channel width) in the entrance side common flow channels Rin1, Rin2, and the flow channel widths (the first exit side flow channel width Wout1 and the second exit side flow channel width) in the exit side common flow channels Rout1, Rout2 are each made constant along the extending direction (the X-axis direction) of each of the common flow channels, the following results.
  • the structure of each of the entrance side common flow channels Rin1, Rin2 and the exit side common flow channels Rout1, Rout2 it becomes possible to maintain the existing structure.
  • the one side along the extending direction (the Y-axis direction) in each of the dummy channels C1d, C2d forms the side surface described above, and at the same time, the other side along the extending direction thereof opens up to the end part along the Y-axis direction of the actuator plate 412, the following results. That is, as described above, in the structure in which the nozzle holes H1 adjacent to each other (and the nozzle holes H2 adjacent to each other) along the X-axis direction are arranged so as to be shifted from each other along the Y-axis direction, it becomes possible to arrange the nozzle holes H1, H2 in the nozzle plate 411 at high density without changing the overall size (the chip size) of the head chip 41.
  • each of the dummy channels C1d, C2d opens up to the end part described above, it becomes possible to form the individual electrodes Eda to individually be disposed in the dummy channels C1d, C2d separately (in the state of being electrically isolated) from the common electrodes Edc to be disposed in the ejection channels C1e, C2e.
  • the present embodiment it becomes possible to realize to make the manufacturing process of the head chip 41 easy while achieving the reduction in chip size in the head chip 41.
  • Modified Example 1 through Modified Example 4 of the embodiment described above will be described. It should be noted that the same constituents as those in the embodiment are denoted by the same reference symbols, and the description thereof will arbitrarily be omitted.
  • FIG. 13 and FIG. 14 are each a cross-sectional view (a Y-Z cross-sectional view) schematically showing an example of a positional relationship between the nozzle holes H1, H2 and the expansion flow channel part related to Modified Example 1 and so on.
  • FIG. 13(A) is a diagram showing a cross-sectional configuration of an expansion flow channel part 431a and so on in an inkjet head 4a (a head chip 41a) according to Modified Example 1.
  • FIG. 13(B) and FIG. 13(C) are diagrams showing the cross-sectional configurations (the cross-sectional configurations shown in FIG. 7(A) and FIG.
  • FIG. 14(A) is a diagram showing a cross-sectional configuration of an expansion flow channel part 432a and so on in the inkjet head 4a (the head chip 41a) according to Modified Example 1.
  • FIG. 14(B) and FIG. 14(C) are diagrams showing the cross-sectional configurations (the cross-sectional configurations shown in FIG. 8(A) and FIG. 8(B) described above) in the expansion flow channel part 432 in the embodiment described above and the expansion flow channel part 402 in Comparative Example 4, respectively, in contrast with each other.
  • the inkjet head 4a according to Modified Example 1 corresponds to what is provided with the head chip 41a instead of the head chip 41 in the inkjet head 4 according to the embodiment. It should be noted that such an inkjet head 4a corresponds to a specific example of the "liquid jet head" in the present disclosure.
  • expansion flow channel parts 431a, 432a described below are formed instead of the expansion flow channel parts 431, 432 in the head chip 41, respectively (see FIG. 13(A) and FIG. 14(A) ).
  • expansion flow channel part 431a corresponds to a specific example of the "first expansion flow channel part” in the present disclosure.
  • expansion flow channel part 432a corresponds to a specific example of the "second expansion flow channel part” in the present disclosure.
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 431a coincides with the central position Pn11 of the nozzle hole H11.
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 431a coincides with the central position of the nozzle hole H21.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 432a coincides with the central position Pn12 of the nozzle hole H12.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 432a coincides with the central position of the nozzle hole H22.
  • the inkjet head 4a (the head chip 41a) according to Modified Example 1 having such a configuration, it is possible to obtain basically the same advantages due to substantially the same function as that of the inkjet head 4 (the head chip 41) according to the embodiment.
  • the central position Ph31 along the Y-axis direction in the expansion flow channel part 431a coincides with each of the central position Pn11 of the nozzle hole H11 and the central position of the nozzle hole H21.
  • the central position Ph32 along the Y-axis direction in the expansion flow channel part 432a coincides with each of the central position Pn12 of the nozzle hole H12 and the central position of the nozzle hole H22.
  • the head value margin in the whole of the head chip 41a increases, and as a result, the ejection characteristics of the ink 9 in the inkjet head 4a are improved. Therefore, also in Modified Example 1, similarly to the embodiment, it becomes possible to improve the print image quality while suppressing the manufacturing cost of the head chip 41a.
  • FIG. 15 is a diagram showing an example of a simulation result related to Modified Example 1 described above, and Comparative Example 3 and Comparative Example 4 described above.
  • FIG. 15(A) shows a simulation result of the pressure in the vicinity of the nozzle hole H1, H2 related to Comparative Example 3 and Comparative Example 4 with respect to the pressure value (see Modified Example 3: FIG. 13(C) ) in the vicinity of the nozzle hole H11, H21 and the pressure value (see Modified Example 4: FIG. 14(C) ) in the vicinity of the nozzle hole H12, H22.
  • FIG. 15(B) shows a simulation result of the pressure in the vicinity of the nozzle hole H1, H2 related to Modified Example 1 with respect to the pressure value (see FIG.
  • FIG. 16 and FIG. 17 are each a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of an inkjet head 4b according to Modified Example 2.
  • FIG. 16 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H11 (the ejection channel C1e1) in the inkjet head 4b according to Modified Example 2, and corresponds to FIG. 3 in the embodiment.
  • FIG. 17 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H12 (the ejection channel C1e2) in the inkjet head 4b according to Modified Example 2, and corresponds to FIG. 4 in the embodiment.
  • the inkjet head 4b according to Modified Example 2 corresponds to what is provided with a head chip 41b instead of the head chip 41 in the inkjet head 4 (see FIG. 3 and FIG. 4 ) according to the embodiment. It should be noted that such an inkjet head 4b corresponds to a specific example of the "liquid jet head" in the present disclosure.
  • expansion flow channel parts 431b, 432b described below are formed instead of the expansion flow channel parts 431, 432 in the head chip 41, respectively (see FIG. 16 and FIG. 17 ).
  • expansion flow channel part 431b corresponds to a specific example of the "first expansion flow channel part” in the present disclosure.
  • expansion flow channel part 432b corresponds to a specific example of the "second expansion flow channel part” in the present disclosure.
  • expansion flow channel parts 431b, 432b unlike the expansion flow channel parts 431, 432, one end part along the Y-axis direction in the expansion flow channel parts 431b, 432b (the opening parts H31, H32) expands to the outside of the pump chamber described above.
  • the end part on the first supply slit Sin1 side in the wall part W1 is disposed on the first supply slit Sin1 side of the reference position.
  • the end part on the second supply slit side in the wall part W2 is disposed on the second supply slit side of the reference position.
  • the end part on the first discharge slit Sout1 side and the end part on the second discharge slit side in the expansion flow channel part 431b are both located inside the pump chamber described above similarly to the expansion flow channel part 431 described in the embodiment.
  • the end part on the first discharge slit Sout1 side in the wall part W1 is disposed on the first discharge slit Sout1 side of the reference position.
  • the end part on the second discharge slit side in the wall part W2 is disposed on the second discharge slit side of the reference position. It should be noted that the end part on the first supply slit Sin1 side and the end part on the second supply slit side in the expansion flow channel part 432b are both located inside the pump chamber described above similarly to the expansion flow channel part 432 described in the embodiment.
  • FIG. 18 and FIG. 19 are each a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of an inkjet head 4c according to Modified Example 3.
  • FIG. 18 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H11 (the ejection channel C1e1) in the inkjet head 4c according to Modified Example 3, and corresponds to FIG. 3 in the embodiment.
  • FIG. 19 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H12 (the ejection channel C1e2) in the inkjet head 4c according to Modified Example 3, and corresponds to FIG. 4 in the embodiment.
  • the inkjet head 4c according to Modified Example 3 corresponds to what is provided with the head chip 41c instead of the head chip 41 in the inkjet head 4 (see FIG. 3 and FIG. 4 ) according to the embodiment. Further, the head chip 41c according to Modified Example 3 corresponds to what is obtained by eliminating the alignment plate 415, and at the same time, providing a nozzle plate 411c described below instead of the nozzle plate 411 in the head chip 41, and the rest of the configuration is made basically the same. It should be noted that such an inkjet head 4c corresponds to a specific example of the "liquid jet head" in the present disclosure.
  • Such a nozzle plate 411c is provided with expansion flow channel parts 431c, 432c having substantially the same functions as those of the expansion flow channel parts 431, 432 described in the embodiment (see FIG. 18 and FIG. 19 ).
  • the expansion flow channel part 431c for expanding the cross-sectional area (the flow channel cross-sectional area Sf3) of the flow channel of the ink 9 in the vicinity of the nozzle hole H11, H21 is formed in the vicinity of the nozzle hole H11, H21 in the nozzle plate 411c (see FIG. 18 ).
  • the expansion flow channel part 432c for expanding the cross-sectional area (the flow channel cross-sectional area Sf4) of the flow channel of the ink 9 in the vicinity of the nozzle hole H12, H22 is formed in the vicinity of the nozzle hole H12, H22 in the nozzle plate 411c (see FIG. 19 ).
  • both of the expansion flow channel parts 431, 432 are configured so as to include the opening parts H31, H32 in the alignment plate 415, respectively, in the head chip 41c according to Modified Example 3, both of the expansion flow channel parts 431c, 432c are provided to the nozzle plate 411c.
  • such expansion flow channel parts 431c, 432c are each formed of a step-like (two-step structure) opening structure communicated with the nozzle hole H11, H12, H21, and H22 on the nozzle plate 411c (see FIG. 18 and FIG. 19 ).
  • expansion flow channel part 431c corresponds to a specific example of the "first expansion flow channel part” in the present disclosure.
  • expansion flow channel part 432c corresponds to a specific example of the "second expansion flow channel part” in the present disclosure.
  • Modified Example 3 similarly to Modified Example 2 described above, it is possible to arrange that one end part along the Y-axis direction in the expansion flow channel parts 431c, 432c expands to the outside of the pump chamber described above.
  • the arrangement of expansion flow channel parts in Modified Example 1 can also be provided in the nozzle plate instead of using an alignment plate.
  • FIG. 20 and FIG. 21 are each a diagram schematically showing a cross-sectional configuration example (a Y-Z cross-sectional configuration example) of an inkjet head 4d according to Modified Example 4.
  • FIG. 20 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H11 (the ejection channel C1e1) in the inkjet head 4d according to Modified Example 4, and corresponds to FIG. 3 in the embodiment.
  • FIG. 21 shows the cross-sectional configuration example corresponding to a part including the nozzle hole H12 (the ejection channel C1e2) in the inkjet head 4d according to Modified Example 4, and corresponds to FIG. 4 in the embodiment.
  • the inkjet head 4d according to Modified Example 4 corresponds to what is provided with the head chip 41d instead of the head chip 41 in the inkjet head 4 (see FIG. 3 and FIG. 4 ) according to the embodiment. Further, the head chip 41d according to Modified Example 4 corresponds to what is obtained by eliminating the alignment plate 415, and at the same time, providing an actuator plate 412d described below instead of the actuator plate 412 in the head chip 41, and the rest of the configuration is made basically the same. It should be noted that such an inkjet head 4d corresponds to a specific example of the "liquid jet head" in the present disclosure.
  • Such an actuator plate 412d is provided with expansion flow channel parts 431d, 432d having substantially the same functions as those of the expansion flow channel parts 431, 432 described in the embodiment (see FIG. 20 and FIG. 21 ).
  • the expansion flow channel part 431d for expanding the cross-sectional area (the flow channel cross-sectional area Sf3) of the flow channel of the ink 9 in the vicinity of the nozzle hole H11, H21 is formed in the vicinity of the nozzle hole H11, H21 in the actuator plate 412d (see FIG. 20 ).
  • the expansion flow channel part 432d for expanding the cross-sectional area (the flow channel cross-sectional area Sf4) of the flow channel of the ink 9 in the vicinity of the nozzle hole H12, H22 is formed in the vicinity of the nozzle hole H12, H22 in the actuator plate 412d (see FIG. 21 ).
  • both of the expansion flow channel parts 431, 432 are configured so as to include the opening parts H31, H32 in the alignment plate 415, respectively, in the head chip 41d according to Modified Example 4, both of the expansion flow channel parts 431d, 432d are provided to the actuator plate 412d.
  • such expansion flow channel parts 431d, 432d are each formed of a step-like (two-step structure) opening structure communicated with the nozzle hole H11, H12, H21, and H22 on the actuator plate 412d (see FIG. 20 and FIG. 21 ).
  • expansion flow channel part 431d corresponds to a specific example of the "first expansion flow channel part” in the present disclosure.
  • expansion flow channel part 432d corresponds to a specific example of the "second expansion flow channel part” in the present disclosure.
  • Modified Example 4 similarly to Modified Example 2 described above, it is possible to arrange that one end part along the Y-axis direction in the expansion flow channel parts 431d, 432d expands to the outside of the pump chamber described above.
  • the arrangement of expansion flow channel parts in Modified Example 1 can also be provided in the actuator plate instead of using an alignment plate.
  • the description is presented specifically citing the configuration examples (the shapes, the arrangements, the number and so on) of each of the members in the printer and the inkjet head, but those described in the above embodiment and so on are not limitations, and it is possible to adopt other shapes, arrangements, numbers and so on.
  • the values or the ranges, the magnitude relation and so on of a variety of parameters described in the above embodiment and so on are not limited to those described in the above embodiment and so on, but can also be other values or ranges, other magnitude relation and so on.
  • the description is presented citing the inkjet head 4 of the two-row type (having the two nozzle arrays An1, An2), but the example is not a limitation.
  • the description is presented citing when the ejection channels (the ejection grooves) and the dummy channels (the nonejection grooves) each extend along the Y-axis direction (a direction perpendicular to the direction in which the channels are arranged side by side) in the actuator plate as an example, but this example is not a limitation. Specifically, it is also possible to arrange that, for example, the ejection channels and the dummy channels extend along an oblique direction (a direction forming an angle with each of the X-axis direction and the Y-axis direction) in the actuator plate.
  • each of the nozzle holes H1, H2 is not limited to the circular shape as described in the above embodiment and so on, but can also be, for example, an elliptical shape, a polygonal shape such as a triangular shape, or a star shape.
  • the cross-sectional shape of each of the ejection channels C1e, C2e and the dummy channels C1d, C2d is described citing when being formed by the cutting work by the dicer to thereby have the side surface shaped like an arc (a curved surface) in the embodiment and so on described above as an example, but this example is not a limitation.
  • each of the ejection channels C1e, C2e and the dummy channels C1d, C2d becomes a variety of side surface shapes other than the arc-like shape by forming the channels using other processing method (e.g., etching or blast processing) than such cutting work with a dicer.
  • other processing method e.g., etching or blast processing
  • the description is presented citing the circulation type inkjet head for using the ink 9 while circulating the ink 9 between the ink tank and the inkjet head as an example, but the example is not a limitation. Specifically, in some cases, for example, it is also possible to apply the present disclosure to a non-circulation type inkjet head using the ink 9 without circulating the ink 9.
  • the structure of the inkjet head it is possible to apply those of a variety of types.
  • the description is presented citing as an example a so-called side-shoot type inkjet head for ejecting the ink 9 from a central part in the extending direction of each of the ejection channels in the actuator plate. It should be noted that this example is not a limitation, but it is possible to apply the present disclosure to an inkjet head of another type.
  • the type of the printer is not limited to the type described in the embodiment and so on described above, and it is possible to apply a variety of types such as an MEMS (Micro Electro-Mechanical Systems) type.
  • MEMS Micro Electro-Mechanical Systems
  • the series of processes described in the above embodiment and so on can be arranged to be performed by hardware (a circuit), or can also be arranged to be performed by software (a program).
  • the software is constituted by a program group for making the computer perform the functions.
  • the programs can be incorporated in advance in the computer described above and are then used, or can also be installed in the computer described above from a network or a recording medium and are then used.
  • the description is presented citing the printer 1 (the inkjet printer) as a specific example of the "liquid jet recording device" in the present disclosure, but this example is not a limitation, and it is also possible to apply the present disclosure to other devices than the inkjet printer.
  • the "liquid jet head” (the inkjet head) of the present disclosure is applied to other devices than the inkjet printer.
  • the "liquid jet head” of the present disclosure is applied to a device such as a facsimile or an on-demand printer.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)

Claims (8)

  1. Puce de tête (4) configurée pour projeter un liquide (9), comprenant :
    une plaque d'actionnement (412) comportant une pluralité de gorges d'éjection (C1e) disposées côte à côte dans un sens prédéterminé (X) ;
    une plaque de buses (411) dotée d'une pluralité de trous de buses (H1) en communication individuelle avec la pluralité de gorges d'éjection (C1e), et
    une plaque OK de recouvrement (413) dotée d'un premier trou traversant (Sin1) configuré pour faire s'écouler le liquide dans les gorges d'éjection (C1e), un second trou traversant (Sout1) configuré pour faire s'écouler le liquide hors des gorges d'éjection (C1e), et un élément paroi (W1) configuré pour couvrir les gorges d'éjection,
    la pluralité de trous de buses (H1) incluant
    une pluralité de premiers trous de buses (H11) et une pluralité de seconds trous de buses (H12) ; et
    la pluralité de gorges d'éjection (C1e) comprenant une pluralité de premières gorges d'éjection (C1e1) et une pluralité de secondes gorges d'éjection (C1e2),
    les premiers trous de buses (H11) étant disposés de manière à être décalés vers le premier trou traversant (Sin1) dans un sens d'extension (Y) des premières gorges d'éjection (C1e1) en référence à une position centrale (Pc1) dans le sens d'extension (Y) des gorges d'éjection, et
    les seconds trous de buses (H12) étant disposés de manière à être décalés vers le second trou traversant (Sout1) dans le sens d'extension (Y) des secondes gorges d'éjection (C1e2) en référence à une position centrale (Pc1) dans le sens d'extension (Y) des gorges d'éjection ;
    dans une première gorge d'éjection (C1e1) parmi la pluralité de premières gorges d'éjection, sous forme de la gorge d'éjection en communication avec un premier trou de buse (H11) parmi la pluralité de premiers trous de buses, une première zone de section transversale (Sfin1) sous forme d'une zone de section transversale d'un canal d'écoulement du liquide dans une pièce en communication avec les premiers trous traversants (Sin1) est inférieure à une deuxième zone de section transversale (Sfout1) sous forme d'une section transversale d'un canal d'écoulement du liquide dans une pièce en communication avec le second trou traversant (Sout1),
    dans une seconde gorge d'éjection (C1e2) parmi la pluralité de secondes gorges d'éjection, sous forme de la gorge d'éjection en communication avec un second trou traversant (H12) parmi la pluralité de seconds trous traversants, la deuxième zone de section transversale (Sfout1) est inférieure à la première zone de section transversale (Sfin1),
    une première pièce de canal d'écoulement à expansion (431) configurée pour agrandir une troisième zone de section transversale (Sf3) sous forme d'une zone de section transversale d'un canal d'écoulement du liquide à proximité des premiers trous de buses (H11) est formée à proximité des premiers trous de buses (H11),
    une seconde pièce de canal d'écoulement à expansion (432) configurée pour agrandir une quatrième zone de section transversale (Sf4) sous forme d'une zone de section transversale d'un canal d'écoulement du liquide à proximité des seconds trous de buses (H12) est formée à proximité des seconds trous de buses (H12),
    une position centrale (Ph31) dans le sens d'extension (Y) des premières gorges d'éjection (C1e1) dans la première pièce de canal d'écoulement à expansion (431) coïncide avec une première position centrale (Pn11) sous forme d'une position centrale du premier trou de buse (H11), ou est décalée vers le premier trou traversant (Sin1) dans le sens d'extension (Y) des premières gorges d'éjection (C1e1) en partant de la première position centrale (Pn11), et
    une position centrale (Ph32) dans le sens d'extension (Y) des secondes gorges d'éjection (C1e2) dans la seconde pièce de canal d'écoulement à expansion (432) coïncide avec une seconde position centrale (Pn12) sous forme d'une position centrale du second trou de buse (H12), ou est décalée vers le second trou traversant (Sout1) dans le sens d'extension (Y) des secondes gorges d'éjection (C1e2) en partant de la seconde position centrale (Pn12).
  2. Puce de tête selon la revendication 1, comprenant en outre :
    une plaque d'alignement (415) qui est disposée entre la plaque d'actionnement (412) et la plaque de buses (411), et comporte des troisièmes trous traversants (H31, H32),
    la première pièce de canal d'écoulement à expansion (431) et la seconde pièce de canal d'écoulement à expansion (432) étant chacune configurée pour inclure les troisièmes trous traversants (H31, H32) dans la plaque d'alignement (415).
  3. Puce de tête selon la revendication 1, dans laquelle
    la première pièce de canal d'écoulement à expansion (431) et la seconde pièce de canal d'écoulement à expansion (432) sont chacune prévue sur la plaque de buses (411).
  4. Puce de tête selon la revendication 1, dans laquelle la première pièce de canal d'écoulement à expansion (431) et la seconde pièce de canal d'écoulement à expansion (432) sont chacune prévue sur la plaque d'actionnement (412).
  5. Puce de tête selon l'une quelconque des revendications 1 à 4, dans laquelle
    la définition d'une partie terminale du côté du premier trou traversant (Sin1) dans la partie paroi (W1) en tant que position de référence, d'une partie terminale du côté du premier trou traversant (Sin1) dans la première pièce de canal d'écoulement à expansion (431) a lieu sur le côté du second trou traversant (Sout1) de la position de référence, et
    la définition d'une partie terminale du côté du second trou traversant (Sout1) dans la partie paroi (W1) en tant que position de référence, d'une partie terminale du côté du second trou traversant (Sout1) dans la seconde pièce de canal d'écoulement à expansion (432) a lieu sur le côté du premier trou traversant (Sin1) de la position de référence.
  6. Puce de tête selon l'une quelconque des revendications 1 à 4, dans laquelle
    la définition d'une partie terminale du côté du premier trou traversant (Sin1) dans la partie paroi (W1) en tant que position de référence, d'une partie terminale du côté du premier trou traversant (Sin1) dans la première pièce de canal d'écoulement à expansion (431) a lieu sur le côté du premier trou traversant (Sin1) de la position de référence, et
    la définition d'une partie terminale du côté du second trou traversant (Sout1) dans la partie paroi (W1) en tant que position de référence, d'une partie terminale du côté du second trou traversant (Sout1) dans la seconde pièce de canal d'écoulement à expansion (432) a lieu sur le côté du second trou traversant (Sout1) de la position de référence
  7. Tête de projection de liquide (4) comprenant la puce de tête (41) selon l'une quelconque des revendications 1 à 6.
  8. Dispositif d'enregistrement de projection de liquide (1) comprenant la tête de projection de liquide (4) selon la revendication 7.
EP20210390.9A 2019-11-28 2020-11-27 Puce de tête, tête à jet liquide et dispositif d'impression à jet liquide Active EP3827993B1 (fr)

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JPWO2022244698A1 (fr) 2021-05-19 2022-11-24
EP4151416A1 (fr) * 2021-09-16 2023-03-22 Canon Kabushiki Kaisha Tête d'impression à jet d'encre à flux continu et amortissement des impulsions de pression

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JP2008201023A (ja) * 2007-02-21 2008-09-04 Sii Printek Inc ヘッドチップ、インクジェットヘッド及びインクジェット記録装置
JP2010234539A (ja) * 2009-03-30 2010-10-21 Panasonic Corp 液体吐出装置及びその製造方法
JP5032613B2 (ja) * 2010-03-02 2012-09-26 東芝テック株式会社 インクジェットヘッド、インクジェット記録装置
JP6117044B2 (ja) * 2013-07-29 2017-04-19 エスアイアイ・プリンテック株式会社 液体噴射ヘッド、液体噴射装置及び液体噴射ヘッドの製造方法
JP6269215B2 (ja) 2014-03-19 2018-01-31 セイコーエプソン株式会社 液体噴射ヘッド及び液体噴射装置
JP6410528B2 (ja) * 2014-08-29 2018-10-24 キヤノン株式会社 液体吐出ヘッドとそれを用いたヘッドユニット
JP6684068B2 (ja) * 2015-10-16 2020-04-22 エスアイアイ・プリンテック株式会社 液体噴射ヘッド、及び液体噴射装置
CN107433777B (zh) * 2016-05-27 2020-05-12 精工电子打印科技有限公司 液体喷射头以及液体喷射装置
JP7019973B2 (ja) * 2017-06-09 2022-02-16 コニカミノルタ株式会社 インクジェットヘッド及びインクジェット記録装置
JP6968669B2 (ja) * 2017-11-13 2021-11-17 エスアイアイ・プリンテック株式会社 ヘッドチップ、液体噴射ヘッドおよび液体噴射記録装置
JP2019089224A (ja) * 2017-11-13 2019-06-13 エスアイアイ・プリンテック株式会社 ヘッドチップ、液体噴射ヘッドおよび液体噴射記録装置
JP2019089221A (ja) * 2017-11-13 2019-06-13 エスアイアイ・プリンテック株式会社 ヘッドチップ、液体噴射ヘッドおよび液体噴射記録装置
JP2019089222A (ja) * 2017-11-13 2019-06-13 エスアイアイ・プリンテック株式会社 ヘッドチップ、液体噴射ヘッドおよび液体噴射記録装置
JP2019089234A (ja) * 2017-11-14 2019-06-13 エスアイアイ・プリンテック株式会社 液体噴射ヘッドおよび液体噴射記録装置
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US20210162756A1 (en) 2021-06-03
CN112848686A (zh) 2021-05-28
JP7314031B2 (ja) 2023-07-25
EP3827993A1 (fr) 2021-06-02
ES2960924T3 (es) 2024-03-07
CN112848686B (zh) 2023-11-17
US11225079B2 (en) 2022-01-18

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